Epson FX 890 - B/W Dot-matrix Printer User Manual

FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-
2
Table 3-2. Printhead Solenoid Resistance
Part Test Pin Number
(See the figure
below.)
Test Method
(Set Meter to Ohms. Disconnect Motor
from Main Board and check it with
Printer Power off.)
Specifications
Printhead
− Common pin :C1
Test pins: 1, 4
− Common pin :C2
Test pin: 8
− Common pin: C3:
Test pins: 2, 6
− Common pin: C4:
Test pins: 5, 9
− Common pin :C5
Test pins: 3, 7
For example, place one lead on pin C1
and the other lead on Test pin 1 to check
#1 pin of the Printhead solenoid. Test pin
numbers match the printhead solenoid
(dot wire) numbers.
8.19 ± 0.8Ω
(at 25°C)
A
2
C1
6
C2
C3
4
8
9
C4
7
C5
5
1
3
T
T
View A
Printhead
Printhead Connenctor
Printhead Connenctor
Figure 3-2. Printhead Connector Pin Alignment
Table 3-3. Printhead Driver Test Pin
Transistor Numbers Test Method
(Set meter to diodes. Check
power off.)
Meter Reading
Q2, Q3, Q4, Q5, Q6,Q7,
Q8, Q9, Q10 ,Q11,Q12,
Q13, Q14, Q15, Q16, Q17,
Q18, Q19, Q20
Check the following:
− From the base to the collector
− From the base to the emitter
Reverse the leads and test
again.
The tester shows neither open
nor shorted.

Epson FX 890 - B/W Dot-matrix Printer Specifications

General

Brand	Epson
Model	FX 890 - B/W Dot-matrix Printer
Category	Printer
Language	English